Parks and Recreation co-creator Michael Schur has dismissed suggestions that Megan Mullally will become a series regular.

The former Will & Grace star previously appeared on the show as Ron's ex-wife Tammy and will reprise the role in the third season.

"[Tammy] is basically the most diabolical and evil human being alive, so it might be hard to parse that out every week," Schur told The Futon Critic. "I can certainly imagine doing an extended arc with her character if we could find a good story for her to be involved in [for] more than one episode."

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He added that the character was the NBC sitcom's "secret weapon".

"Megan is perfect, because she draws something out of Ron Swanson... that no one else in the world of our show can draw out of him," he claimed. "You drop that little droplet of crazy into the show and watches what happens."

Schur also revealed that Ron's unseen first wife, also named Tammy, could appear in a future episode.

"There are a couple [of] references... made to the first Tammy Swanson and she is lingering out there this season," he explained. "I don't want to spoil anything but there is a moment in the season when you kind of get the sense that she's about to show up."